INDUCTION OF PHASE SHIFT 



545 



ILLUMINATION 



® 



8 |I2 



PhTR 



16 20 24 4 4 



16 20 24 



TIME 



4 8 12 16 



1 — r . 



ILLUMINATION 



Fig. 2 (Continued) 



counts included two measures: (1) the number of experimental cells 

 that participate in the initial agglutination masses formed between 

 the cells in the vials and known reactive test cells (Ehret, 1953) of 

 complementary mating type 10 min after mixing; this measure is the 

 reaction magnitude (RM) of agglutination; (2) the number of con- 

 jugant pairs formed as a consequence of this mixture, 6 hr after mix- 

 ing. In each measure it was possible to distinguish between the experi- 

 mental animals and the testers, because the former were colorless, 

 whereas the latter were green (C/7/ore//fl-containing cells of mating 

 type A). The contribution of the second measure was to assign an 

 ascending or descending direction to a curve from a given point: this 

 is valid because many conjugants are formed from early reactive 

 period mixtures, whereas few conjugants are formed from late reactive 



